Unit 3 Section 10-4

10-4: Regression Lines on the TI  Step 1: Enter the scatter plot data into L1 and L2  Step 2 : Plot your scatter plot  Remember to set your window accurately  Step 3: Calculate the line of best fit using a Linear Regression  Step 4 : Graph your regression line

Section 10-4 Entering the Scatter Plot  Press to access your tables.  Enter the data in each column  (x’s in L1, y’s in L2)  Return to the main window:

Section 10-4 Turning on the Plot  Press to turn your plot on.  Make sure your screen looks like this:

Section 10-4 Setting the Window  Press to set your view window.  This is the stat view window.  You should have a scatter plot on your viewing window.

Section 10-4 Calculating the Linear Regression  Press  This will calculate your linear regression.  Depending on your model of calculator, you may have to hit enter 4 more times to receive data.  The a value represents your slope, b represents your y-intercept.

Section 10-4 Graphing your Linear Regression  Press  Enter your equation into Y1  Make sure you have your slope and y-intercept to three decimal places  Press to view your graph. Your line should pass directly through your data.

Section 10-4 Homework  Pg 552: # 29, 31 (do parts a, b, e, and f only)